Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Spanish
-tat
←
Proto-Indo-European
*-teh₂ts
(inherited)
←
Latin
-tās
(inherited)
→
Spanish
-tad
(inherited)
→
Latin
-tas
(link)